Security readout for executives and security teams
Plain-English summary
LibreDWG/libredwg can overflow heap memory while decoding DWG application information. In business terms, systems that automatically process untrusted DWG files could crash or potentially face memory-corruption risk. The public sources do not provide severity scoring, confirmed exploitation, or a named fixed release.
Executive priority
Treat this as a targeted exposure question rather than a broad emergency. Prioritize teams that process external DWG files or run automated CAD conversion services. Urgency increases if vulnerable libredwg is internet-facing or processes customer-supplied files at scale.
Technical view
CVE-2021-39527 is a heap-based buffer overflow in appinfo_private() in decode.c in LibreDWG/libredwg through v0.10.1.3751. The sources do not provide CVSS metrics, CWE metadata, exploit confirmation, or detailed remediation guidance.
Likely exposure
Exposure is most likely where LibreDWG/libredwg is embedded in CAD, file-conversion, indexing, preview, or ingestion workflows that parse DWG files, especially from external users or partners. The affected product metadata is incomplete in the source bundle.
Exploitation context
The source bundle says KEV is false and provides no cited evidence of active exploitation. Public detail is limited to a GitHub issue and CVE records describing the vulnerable function and overflow class.
Researcher notes
The sources establish the vulnerable function and version ceiling but omit exploitability detail, CVSS, patch information, and affected downstream products. Avoid assuming code execution or a fix version without vendor confirmation.
Mitigation direction
- Inventory systems and applications that use LibreDWG/libredwg.
- Identify deployments running libredwg through v0.10.1.3751.
- Check LibreDWG vendor guidance and issue 252 for fix status.
- Restrict processing of untrusted DWG files until remediated.
- Isolate DWG parsing services from sensitive networks and data.
Validation and detection
- Confirm whether libredwg is present in application dependencies.
- Record exact libredwg versions in packages, containers, and build artifacts.
- Map workflows that ingest DWG files from external sources.
- Review crash reports involving DWG parsing or decode.c paths.
- Track vendor issue status before declaring remediation complete.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-39527 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/LibreDWG/libredwg/issues/252CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.